<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* id>类>标签 */
        /* 100 + 10 + 10 = 120 */
            #nav .section .container{
                color: red;
            }
            /* 100 + 10 = 110 */
            #nav .title
            {
                color: aquamarine;
            }
    </style>
</head>
<body>
    <div id="nav">
        <div class="section">
            <div class="title">111</div>
            <div class="container">222</div>
        </div>
    </div>
</body>
</html>